not all people are having problems and it never hurts to try so go ahead i was able to activate the first day hours after purchasing and the next morning also. (because i had reformatted my iPhone) but yeah go ahead and try activating its not like itll mess up your iPhone if it doesn't work
edit.. i guess it depends on whether your an existing customer or not. well i am an existing customer so maybe thats why it worked so easily fo rme
My husband was also an existing customer and switched from a razr. Took him almost 40 hours to activate, and it only happened after I called the 877 number posted here and the rep there activated him while I was on the phone.
I was with sprint and tried to port my number over. iTunes said I couldn't do that and I hadn't read this thread yet so I just started a new account with ATT and it took literally 2-3 minutes and I was up and running with a new number.